During our recent adventure through Heaps Canyon we managed to core shot a 8.3mm rope on the final rappel. After we got finished we wanted to break test the rope to see what it would really hold even though it looked pretty nasty. After finishing fabrication on our break test machine, I tested the damaged rope. It broke at 8.28 kN (1861 Lbs). The surprising thing is it did not break where the core was exposed. Instead it broke about 8 inches below that in a spot that did not appear to be damaged. Test machine I fabricated. Rope we damaged in Heaps Canyon and had to rappel on for the last rap. Setup for break testing. Break at 8.28 kN. Note it did not break in the damaged area. Dynamometer we are using on our break test machine. RAT carabiner broke at 25 kN Doing some accessory cord testing.